Fluid system and regulating device therefor



T. A. BAKER Mrch 23, 1943.

FLUID SYSTEM AND REGULA'ING DEVICES THEREFOR Filed June 15, 1940 2 Sheets-Sheet l i N VENTOR. liwmaA.

w MM2? ATTORNEY.v

March 1943. T A BAKER 2,314,569

FLUID SYSTEM AND REGULATING DEVICES THEHEFDR Filed June 15, 1940 v 2 sheets-shea 2 "Il". 04 i 46nd 7 5 INVENTOR Fromm Y Patented Mar. 23, 1 943 FLUID srs'raiu m'aaom'rme nnvrc mamon Thomas A. Baker, Logansport, Ind. Application June l5, 1940, Serial No. 340,852

9 Claims.

My invention pertains to a iluid system and a regulating device therefor and'more particularly to an air conditioning system and regulating device which vwill regulate the flow of conditioned air to an enclosure.

My device is adapted mary air-from a furnace, air conditioner and/or ventilator with untreated or secondary air from some other source; the preferred source oi said secondary air being the room into which the primary air is discharged.

An object of my invention is to provide a device for mixing primary air with secondary air in accordance with the condition of the secondary air.l v

Another object of'my invention is to thermostatically regulate the temperature oi' a 'room or enclosure by the temperature of the air which is removed therefrom for recirculation.

l Still another oblect of my invention is to provide a device for regulating the temperature of a substantially constant ow of air into' a room.

to mix treated or priv vil) A further object of my invention is to mainv tain a substantially constant flow of air vinto an enclosure.

Another object of my invention is to provide a device for mixing primaryand secondary air in proportions regulated by the condition of the secondary air.

A still further object of my invention is to provide a heating, cooling and/or Ventilating system for a plurality of enclosures in which different conditions may be set for the various enclosures and the enclosures maintained at those conditions independently ofv each other. l

Another object oi' my inven'tion is to provide a heating, cooling and/'or ventilating system for al plurality of enclosures in which no enclosure will rob the system of more than its share of the treated air to the exclusion of the other enclosures in the system.

Still another object of my invention is to provide a device which will automatically shut oi! or-restrict the flow of conditioned air to an enclosure when thev iiow increases to a ratewhich vtends to draw the conditioned air from the distribution systemto the detriment of the lother enclosures in the system. A still further object of my inventionv is to provide a conditioning system having individual automatic dampening devices for the enclosures lto be conditioned.

An object oi my invention is to provide-a device for regulating the temperature of a constant fiowof air into a room. 1

icl. ils-33) Another object of my invention is to provide a device which will maintain at substantially a constant value the ilow oi' air into a room.

Another object oi my invention is the provision o! a device for mixing primary air with secondary or recirculated air and to thermostatically regulate the ow of the secondary air to control the temperature oi the-room or enclosure into which the air ilows. e

A further object of my vention a device for maintaining constant tne total flow oi' primary and secondary air into a room and to regulate the temperature oi the air in the room by regulating the volume of secondary air recirculated through the device, thereby regulating the ow `ot the primary air to maintain the constant ow.

Another object of my invention is to circulate -the air is a room and tio supplement the recircu lated or secondary air with fresh or primary air.

A further object of my invention is to provide a system for heating or cooling a plurality of rooms or enclosures wherein each room or enclosure may be maintained at its own temperature independent of the temperatures of thev other rooms or enclosures.

Another object oi my invention is to provide aA device for passing primary air into an enclosure and to provide said device with an induction means for inducing secondary air into the primary air stream in quantities determined by the condition of the said secondary air.

Still another object of my invention is to provide a device for delivering a substantially constant volume-of air to a room regardless of the variations in the pressure head of the primary I air.

A still further object of my invention is to provide an air conditioning system in which the dis- -v does not drop below ment for any tribution sytesm need notbe designed to have substantially identical pressure head values at all outlets.

A further object of my invention is to providean air conditioning system having a plurality of outlets each of which will discharge a substantially constant volume of conditioned air so long as the pressure head of the primary air the pressure head requireone of the outlets.

Another object of my invention is to'provide a single device for regulating the volume and temperature of air delivered to aplurality of rooms or enclosures and to' control thedevice".

from the plurality ci rooms.

other objects and a fune: understanding 'or is to provide I on a wall and with parts broken away to show the mechanism;

Figurev 2 is a cross-sectional view of my device taken along line 2-2 of Figure 1;

Figure 3 is a sectional view of a portion of a modied device;

Figure 4 is a diagrammatic view of a system into which my device is adapted to be placed; and

Figure 5 is a diagrammatic view of a modied system into which my device is adapted to be placed.

My regulating device indicated generally by the reference character I6 and my distribution system 5 yare adapted to regulate the condition of air in a plurality of enclosures or rooms such as I0 and II (see Figure 4). By condition is meant the temperature, the humidity, the fresh-v ness, the rate of change of air in the room and all other elementswhich goto make up desired comfortable qualities in air. My device and system are also adapted to regulate the ow of other fluids beside air and my application and the plaster is put on the walls of the house. Lath members 22 are then putin place in front of the stack and branch walls 24 and 28. After the lath is put on, a sheet metal groove piece is fastened to the wall against the lath 22. 'Ihe sheet metal groove piece 28 has a forwardly extending portion I9 and a bent back portion 29 which comprise a groove 30. The front wall 28 of the branch 9 and the front wall 24 of the stack I3 have forwardly extending tongues 39 which are engaged by the groove pieces 29 in substantially air tight engagements. Plaster 2I is put on the lath 22 to form the wall I8 of the enclosure I8.

'I'he mechanism of my device I6 is mounted on top and bottom plates 40 and is adapted to claims are to be read with this in mind. The y fluid distribution system 5 may be similar to the one shown and described in my application entitled Isostatic fluid distribution systems, Se-

rial No. 340,851, led June 15, 1940, wherein the reference character I6 in said application represents my regulating device.

One of my regulating devices I6 may be placed l in enclosure I0 and another in enclosure II and each may be set to maintain a desired temperature in its respective enclosure and to circulate the air in the enclosure at a certain rate. An air conditioner AI2 may be placed in the basementof a building and through the distribution .system 5 and a plurality of branches 9 supply conditioned air to the regulating devices I6. Each regulating4 device may be set to regulate the condition of its enclosure independently of the action of the other regulating devices in the system.

The regulating device I6 comprises a housing I1 adapted to be attached to a wall I8, part of the housing being within the wall and part of the housing extending out of the wall and forming a register through which air may be taken into the housing I1. While my regulating device may be located on, or attached to, a wall, I would like to bring out the point that my device may be located in any position and of course, -it does not needto be attached to anything, except ducts or stacks supplying the primary'air to the equipment and some means provided for discharging the air from the equipment.

In the installation of my regulating device a branch conduit` 9 is run from the distribution system 5 to my regulating device, after which air is distributed to the room I9. The part of the branch conduit above the regulatingV device is known as the stack and is indicated by the reference character I3. The branch conduit 9 and the stack vI3 are shown having a common sheet metal back wall 1. The sheet metal front wall of the branch 9 is indicated by the reference character 28 and the sheet metal front wall of the-stack i3 is indicated `by the reference character'24. vThe sheet metal back wall 1, the front wall 28 of the branch 9 and the front wall 24 of the stack I3 are installed before the device.

slide into the opening between the branch 9 and the stack I3 until a back wall 68 engages the conduit back wall 1. 'Ihe plates 40 make substantially air tight engagements with the wall 24 of the stack I3 and with the wall 28 of the branch 9. A front face or grill portion 6 is positioned over the mechanism and rests against the plaster 2I. The front face 6 engages the metal vgroove pieces 20 to substantially prevent air from leaking therebetween and screw means 69 firmly attach the front face 6 to the metal groove pieces 20 to hold the entire assembly in place against the plaster 2| of the enclosure wall I8. While I have illustrated the above described construction for mounting my regulating device in and to the duct system, it is to be understood that any other method may be employed.

At the top of the device I6 the wall 24 comprises part of an outlet 25 or stack I3 from the device and at the bottom of the device the wall 28 comprises part of an inlet 26 or branch 9 to Air is transmitted to the device I8 by means of the branch 9, and is adapted to pass into the device I6 through the opening 26. After passing through the housing I1 of the device I6 the air passes out of thev opening 25 and through the stack I3 into the room or enclosure I0. The air which enters the device I8 from the branch 9 is conditioned air and will sometimes be referred to hereafter as primary air. The device I6 hasa second entrance opening indicated by the reference character 21. The second entrance opening communicates with the enclosure I0 and air from the enclosure is adapted to flow through the second entrance opening 21 vand into the device I6 whereitis mixed with the primary air. After being mixed with the primary air it passes out of the'l exit opening 25 and through the stack I3 back into y the enclosure. This air which circulates from the enclosure I9 into the device I6 and back into the enclosure I9 is called secondary air.

Above the rst entrance opening 26 there is positioned a substantially air tight shield 3|. The shield 3I curves inwardly into the housing I1. A valve port chamber 32 is positioned under the shield 3| and in such a position that it does Y 4 not extend below the downwardly extending sides of the housing I1. The valve port'chamber 32 has a plurality of triangular shaped ports 33 therein through which conditioned air from the may be transmitted to the other side of the I mit it to the exit opening 2l is an induction means 33 comprising a plurality of louvers. The bottom -louver 36 is positioned over the nozzle 34 and is slightly larger than the nozzle thereby estab` lishing a slot between the nozzle 34 and ther louver 36. Each successive louver up to the top louver 31 is slightly larger than the next preceding one thereby establishing a series ofV slotted openings 38. The general outline of the induction means 35 is rectangular and substantially extends the full length of the housing I1, with each successive louver extending farther out than the next preceding one. Secondary air which enters the housing I1 through the openings 21 surrounds the induction means 39 and due tothe primary air passing through the nozzle 34 at a controlled velocity, induction is sety up at the bottom louver 39. 'I'hat is, the velocity of the moving primary air causes the secondary air to be sucked through Vthe slotted openings 39 and into the induction means 35. As the air passes each successive louver on its way up to the top louver 81 more and more air is sucked through the openings 33 into the induction means 95 where it is mixed with the primary air flowing therethrough. As each vsuccessive louver is larger than the next preceding one, there is sumcient room for the increasing volume of air to pass through the induction means without materially altering the velocity or pressure of the air therein. Care must be taken not to increase the size of the successive louvers too much or the velocity of the air passing therethrough will be reduced and induction will thereby be decreased. During its passage through the induction means 35 the primary air becomes mixed with the secondary air entering'through the slots 38 and when the air reaches the exit vopening 25 in the housing I1 it passes out into the stack I3 as combined or mixed air.

l By setting anv adjustment` on my regulating device it is possible to control the vvolume of mixed primary and secondary air which is passed through the housing I1 and into the enclosure IIJ. This volume adjustment is indicated lgenerally by the reference character 4I and o tight enclosure 43. As llustrated, the air tight enclosure 43 is formed of a substantially rigid diaphragm '44, a flexible bellows member 49 and a stationary member 4B. The stationary member 49 may form part oi' the exit opening 25 andthe impact tube 42 extends throughthe stationary wall 49 into the bellows enclosure.

The diaphragm 44 is movable and as the velocity.

or total head pressure o! the mixed air at the entrance opening to the impact tube 42 increases or decreases a corresponding increase or decrease inthe velocity or total head pressure diaphragm 44. `It is seen therefore that the diaphragm 44 moves responsive to the diiTerence between the velocity or head and the static head Y of the mixed primary and secondary air. At-

tached to the `.diaphragm 44 and extending out of the static pressure chamber 41 and into the region of the ,secondary air is a diaphragm blade v arm 49. A flexible seal 90 is provided between the static pressurechamber 41 and the region of the secondary air lto'permit movement ofthe diaphragm blade arm 49 and to prevent the ilow of air from the static pressure chamber 41 tol the region of the secondary air.

The diaphragm blade ann is connected to a pivotal axis 54 which is journaled in two bearing posts 35 and is adapted to oscillate slightly as the diaphragm blade arm is moved back `and forth. Turnably connected to each bearing post 55 is a pair of spaced bearing wheels 36 and connected to the pivotal axis 84 is a single bearing wheel 51 adapted to roll between the pair of spaced bearixm wheels '38 inthe bearing post. The Wheel 51 rotates easily on the wheels B4 thereby assuring that the axis 54 will pivot easily. Connected to the diaphragm blade arm 49 and adapted to move as the diaphragm blade arm 49 turns the pivotal axis 64 is a valve blade arm 58. The valve blade arm 99 extends substantially perpendicular to the pivotal axis 94 and through a slot in the shield 3i and is connected to a valve blade 59.- A ilexible seal Il is provided to prevent primary air from passing into the housing I1 through the valve blade armA raised and lowered past the port openingsv 33 by the action of the diaphragm blade arm 49 turning the pivotal axis 54. As the valve blade 59 is raised it cuts o the opening in the valvev portV chamber 32 through which conditioned air may enter the housing i1. It will be seen therefore, that the function of this device is such that as the volume of the combined primary and secondary air increases, the velocity head at the impact tube 42 is increased and results in a t higher pressure in the bellows enclosure 43. As the pressure in the bellows enclosure 43 is greater than the pressure in the static pressure chamber 41 the diaphragm 44 will move accordingly, causing movement'oi' the diaphragm blade arm 49 and the valve blade arm 93. The movement oi' -the valve blade arm'li is such as to reduce the ow ofI primary air through the device and reduce the velocity head in thebellows enclosure 43 thereby bringing the volume oi' air discharged down to the amount set by the volume adiusto ment device 4I.

is transmitted to the bellows enclosure 43 and v'I'he volume adjustment device which is in- I dicated generally bv the reference character 4I comprises an adjustable spring member 60 connected to and biasing the pivotal axis 54. An adjusting screw 9i is threadably connected to a stationary lug 92 and is adapted to be turned with respect thereto. One end of the adjusting rcrew IiI is connected to the spring 99 and the other end is positioned-near an adjusting opening 63 in the housing I1.v A screw driver may be inserted through the adjusting opening 93 'to engage the adjusting screw 9i for turning same. As the outer end of the spring 6I!l is anchored to the adjusting screw 9|, turning the screw 4I changes the tension on the spring -99 thereby moving'the valve blade arm. and regulating the volume of air which enters the ports 33. A shut oi lever 64 is positioned on the outside of the housing I1 and connected to a cam 65 on the lnside of the housing. By turning the lever 64 to the olf-position. the cam 65 engages an extension 66 of the valve blade arm 58 and forces it downwardly. This causes the valve blade arm 58 which is on the other side of the pivoted axis 54 from the extension 68 to move upwardly and shut off the flow of air throughthe port 33. The extension 681s lighter than the valve blade arm 58 and thus a counter weight 61 is put onto establish a substantial balance therebetween.

My device I6 is adapted to regulate the temperature in the enclosure I as Well as regulate the quantity of air which is circulated in the enclosure. The temperature of the enclosure is controlled by the temperature of the secondary air which is removed from the enclosure through the secondary opening 21. Positioned inside the housing I1 and adjacent the secondary opening 21 are a plurality of bimetal thermostats 10. As shown, the thermostats 1li are substantially an inverted V in shape, each forming two legs, one leg being attached to a travelingV nut 1I and the other leg being attached to a valve plate 12. I'he bent portion or hinge of the two legs forming the inverted V is positioned between two short Ypieces of angle iron 13 to keep the thermostat in place. The valve plate 12 which is connected to and actuated by the thermostat 12 seats against a valve seat 14 having an opening 19 therein. A temperature regulating mechanism indicated generallyby the reference chara'cter 15 is provided for regulating the temperature of the air in the enclosure I0. When the I each other and the valve plate 12 is thereby moved away from the valve seat 14 increasing the volume of secondary air permitted to enter the housing I1. Stops 18 are provided to prevent the valve plate from being moved too. far.

with it thereby changing the temperature at which the thermostats 10 actuate the valve plate 12 to open and close the opening 19 in the valve seat 14. A minimum opening fork 82 is provided so that thevalve plate 12 may be kept a slight minimum distance on the valve seat 14 toA cause a slight flow of secondary air through the device at all times. The fork 82 is mounted on a threaded adjusting screw 83. The adjusting screw for convenience is positioned inside the temperature adjusting screw 18 and may be actuated by a person removing the control knob 11 and turning the adjusting screw 83 with a screw driver or other suitable instrument. Turning the adjusting screw 83 to the right causes the fork 82 to engage the valve plate 12 through the valve seat opening 19 and push the valve plate 12 slightly away from the seat. It is to be clearly understood that my device can be used for either heating, cooling, or Ventilating. Of course the heating cycle described above would simply be reversed for cooling functions,

that is, when the temperature of the air in enclosure I0 rises above the temperature set for the regulating mechanism 15, the influence on the thermostat 10'will cause a decrease in the amount of secondary airv and indirectly an increase in the amount of primary air, which on this cycle would be so 'called cold air.

In Figure 3 I illustrate v'another method of causing the diaphragm blade arm 49 t6 move and regulate the ilow of primary air through the ports 33. A static pressure opening 84 is provided in the stationary wall member 46 for admitting static pressure to the bellows enclol sure 43 and an atmospheric pressure opening 85 'I'he increase of secondary air in the housing momentarily increases the ilow of air through the induction means 35 and consequently causes a reduction in the volume of primary air admitted into the housing I1. In other words. due to too high temperature in the enclosure IB the proportion of secondary air in the total or mixed air is increased and. the proportion of primary or heated air is decreased, the total volume of air being passed into the enclosure remaining two holes 80 in it through which secondary air can pass at all times. Thus, even ii the valve plate 12 is tightly seated against the valve seat 14 there will be a small quantity of secondary air passing into the housing I1.' This. small Quantity of secondary air is sumcient to influence the thermostat 10 andcause the valve plate 12 to be moved away from the valve seat 14 upon the temperature in the enclosure I0 deviating from the desired temperature set on the temperature regulating mechanism .15.

The temperature regulating mechanism 'Il comprises a control knob 11 mounted on the outside of the housing I1 and a screw 18 turnably connected to the knob 11. The screw 18 is threadably connected to the traveling nut 1I in such a manner that as the knob 11 is turnedthe nut 1I moves and carries the thermostats 1li substantially thesame. The valve plate 12-has is provided through the partition 52 into an enclosure 88 between-the partition 52 and the diaphragm 44. 'I'he chamber 86 which is on the opposite side of the diaphragm 44 from the bellows enclosure 43- thereby becomes an atmospheric pressure chamber and the diaphragm 44 will move in response to the difference between the atmospheric and static pressures existant in the two enclosures. My device has particular utility when used in a system for supplying conditioned Vair to a plurality of rooms or enclosures such as III and II in Figure 4. A device I8 is positioned to condition the air in each enclosure I0 and II and the secondary opening 21 and the outlet head I4 are in communication with the inside of the enclosure. In an installationin a home, for example, it might be the desire of the person living in the home to" maintain his. living room and dining room at 72 degrees, his bath room at 80 degrees and his bedroom at 65 degrees, thereby combining maximum comfort and maximum economy. A device I8 in each of the above named rooms would be set for the temperature desired and thereafter each room would be maintained at substantially the temperature set independent of the settings of theother rooms. An air conditioner I2 such as avheating. cooling. and/or Ventilating device is located in the basement and is connected to the enclosures Il) and II bv means oi' a distribution system 5 which includes the branches 9 leading from the distribution pipe to the device I8. A blower I5 or other means for causing substantially constant air movement is mounted on the furnace I2 and adapted to blow the conditioned aii: into the distribution system 5.

My device I8 automatically regulates and mixes the proper quantity of enclosure or secondary air with a controlled quantity o! primary air to cause a substantially constant quantity oi mixed air to be delivered to the enclosure. Due to the fact that the secondary air isv recirculated the return air ducts tor a plurality of enclosures are greatly reduced and simplified. In some installations, and as shown in Figure 4, only one fproperly centralized return air duct such as 8 is required as the only air which must be returned v to the heating equipment, blower, or the like, is the maximum total amount of primary air handled at any one time by the equipment. While I have shown a return duct system in Figure 4, my regulating devices I6 may operate in a system without return ducts.

During a heating cycle all of the enclosures in my system heat up -at substantially the vrate at which the device is set. That is, no one or two enclosures rob the other enclosures in the system and heat up too much thereby leaving tribution system l. The bellows 88 isvactuated according to the difference between the. static and atmospheric pressures thereon. A pivotabie actuating arm 8| is connected to the pressure differential bellows 88 and is adapted to b e actuated as the bellows 89 moves in accordance. with the pressureA dinerential thereon. The actuating varm 8| is connected to a valve blade arm st' at a pivot point su in such a manner that movement of the actuating arm causes rotation about -the pivot point Iand movement of the valve blade arm 95 to regulate the now oi primary air into the device I6. A support 82 is provided for the the other rooms cold. except as set by my reg'ulating devices. In my system, if enclosure l0 started to heat up too fast the ow of conditioned or primary air rushing in to port 38 in the valve port chamber 32, together with the'high pressure in the bellows enclosure 43 due to the velocity head on .the impact tube 42, would cause the valve blade 58 to close of! the ports 33 and reduce the ow of air therethrough. thereby increasing the amount of conditioned air available for the other enclosure II in the system. Thus, it will be seen that my system is governed, when properly set, to. prevent too great a ilow of conditioned air from entering any enclosure in the system to the exclusion of the other enclosures. My system is also governed to prevent too much heat from going .to any enclosure in the system to the exclusion of any other enclosure. When enclosure I0 heats up to a temperature high enough to cause the secondary air to actuate the thermostats 10, the amount of primary air entering the enclosure I0 is reduced thereby providing more heated air available for room II. Thus by regulating the amount of heated air entering enclosure I0 by a velocity o r volume control and a thermostatic control. I prevent enclosure I8 from robbing enclosure II and provide a balanced conditioning system for all the rooms or enclosures. V i.

Figure 5 illustrates a modified conditioning system in which one device'. I8 Ais adapted to control the temperature of a plurality of enclosures. such for example the two enclosures I8 and II by means of two outlet heads Il, one of said heads I4 being in each of the enclosures I and I I. The airconditioner I2 and the blowerequipment I5 are adapted to force conditioned or primary air through the device I8 which may bel located in the basement near the air conditioner I2. The device I8 regulates the proportion of primary and secondary airw'hich is mixedI and delivered through the distribution system I and the outlet heads I4 to the enclosures I0 andv I I. The centralized return air conduit 8combines the return air from both enclosures III and Il and delivers it to the device I8 as secondary air. A thermostat 81 controls a secondary air inlet valve 88 in accordance with the temperature of the combined return air from` the enclosures I8 and I I, thereby directly controlling the secondary air recirculated and indirectly and automatically controlling the quantity ot primary air which is delivered to the device I8. A pressure diiIerentiai bellows 88 is provided for maintaining substan-l tially constant the now of mixed' air to thedispivot point 9c. To provide for counterbalancing the actuating arm 9| I extend the actuating arm Si beyond the pivot point 8U. This extension is indicated by the reference character 83 and is called the counter balance arm. A weight 84 is movably positioned on the counter balance arm 93 in such a manner that manual movement of the weight 94 with respect to the arm liliV changes the torque about the-pivot point 8u and anects the movement of the valve blade arm 85.

VWith reference to Figure 5, I would like 'to point out that the conduit 8 together with proper adjusting means may be constructedto return room air to the fan and conditioning equipment I2 and I5 for purposes of supplying primary air as well as supplying air to the device I6 for use as secondary air.

Another system of control would be for the return conduit 8 in Figure 5 to be connected to the air conditioner I2 as wellas to the device I6 .to cause enclosure air to be conditioned and returned to the enclosure I0 as primary air. It is also within the purview of this invention that the return conduit be connected directly to the air conditioner I2 and have no connection with the secondary air inlet. -In this arrangement, the secondary air would be obtained from some other source.

It is to be understood that my device could be made such that any variation in the static or velocity pressure of the mixed air quantity would cause the diaphragm mechanism to bring about a change in the secondary air quantity, while the thermostatic element influenced by the secondary air or enclosure temperature would control directly the primary air. That is to say, the varia.-

tion in the static or velocity head pressure. may

thermostatic device may control the quantity of primary air. This function as stated is Just the reverse of the disclosed arrangement.

It is to be understood that a thermostatic control could be `added which would control the primary air directly and that a thermostat for controlling both Vthe primary and secondary air directly could also -be added. These are modifi- ,cations of the disclosed method of altering the proportions oi primary and secondary air which go to make up the t'otal air discharged into an enclosure.

Although I have described my invention with a certain degree oi' particularity, it is understood that the present disclosure has been made only by way of example and that numerous changes in the vdetails of construction and the combinaytion and arrangement ofV parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

I claim as my invention:

1. A device for controlling the ilow of air compriemg, in combination, a housing,` induction means with openings therein in said housing,

6 f said housing having primary inlet means through which primary air may be introduced into said induction means and having secondary inlet means through which secondary air may be introducedl into said housing and around said induction means, said primary air in said induction means comprising a stream which flows through said induction means and picks up secondary air which flows through the said openings in 'the induction means, said housing having outlet means for the mixed primary and secondary air,

prising, in combination, a housing, induction means with openings thereinin saidhousing, said housing having primary inlet means through which primary air may be introduced into said induction means and having secondary inlet means through which secondary air may be introduced into said housing and around said induction means, said primary air in said induction means comprising a stream which flows through said induction means and picks up secondary air which iiows through the said openings in the inductionv means, said housing having outlet means for the mixed primary andsecondary air, means for regulating the volume of secondary air introduced into the said housing, and pressure responsiveA means in contact with the stream of mixed air in the said outlet means for regulating the volume of primary air introduced into the said housing to maintain the quantity of mixed air at a substantially constant value. 3. A vdevice for controlling the flow of air comprising, in combination, a housing, induction means with openings therein in said housing, said housing having primary inlet means through which primary air may be introduced into said induction means and having secondary inlet means A through which secondary air may be introduced into said housing and around said induction means, said primary air in saidA induction means comprising a stream which flows through said induction means and picks up secondary air which flows through the said openings in the in,

duction means, said housing having outlet means ior the mixed primary and secondary air, 'manual l means for regulating the volume of'secondary stant value.

4. A device for controlling the iiow of air com-V prising in combination, a housing having two entrance openings and one exit openingtherein,

induction means in said enclosure positioned to receive a flow of primary air through the rst of saidk entrance openings,vthe second of said entrance openings introducing secondary air into said housing and around said induction means, said induction means having a plurality 0i openings therein through which the ow of primary air induces the secondary air to be mixed therewith, said exit opening providing means for removing said mixed air from said housing, means responsive to the condition of the secondary air to regulate the volume of secondary air introduced into the said housing, and pressure responsive means in contact with the stream of mixed air for regulating the volume of primary air which flows through the said induction means to maintain the volume of the mixed air at a substantially constant value.

5. A device for regulating the condition of air in an enclosure comprising, in combination, a housing With a rst and a second entrance opening and an exit opening therein, induction means in said housing adapted to receive primary air from said first entrance opening and transmit it in a stream to said exit opening, said second entrance opening being in communication with sid enclosure and adapted to pass secondary air from said enclosure into said housing, said induction means having a plurality of openings therein throughwhich the said stream of primary air picks up said secondary air and transmits it as mixed air to said exit opening where it is discharged into said enclosure, manually adjustable temperature responsive means responsive to the condition of the secondary air for regulating the iiow of secondary air into the said housing, means responsive to the mixed air for regulating the flow of primary air into the said induction means to maintain the quantity of mixed air at a substantially constant value, and manual means to adjust the constant value of the quantity of mixed air discharged into said enclosure.

6. A device for regulating air which is discharged into an enclosure comprising in combination, a housing with two entrance opening means and one exit opening means therein, the first of said entrance opening means adapted to pass a quantity of primary air into said housing, the second or said entrance opening means adapted to pass a quantity of secondary air intov said housing wherein the said primary and secondary air mixotogether, the said exit opening means communicating with said enclosure and adapted to pass said mixed air into said enclosure, and means responsive to the mixed air for altering the ratio between the quantities of primary and secondary air which are passed into said housing said means including valve means in the said iirst of said entrance opening means for varying the primary air admitted to the housing to maintain the quantity or mixed air at a. substantially constant value.

7. A device for discharging conditioned air into an enclosure comprising, invcombination, a housf ing with a rst and a second entrance opening and an exit opening therein, said rst entrance opening commuicating with an air conditioning means and adapted to pass a streamoi conditioned air into said housing, said second entrance opening communicating with the said enclosure and adapted to pass secondary air into said housing where the said primary and secondary air mix, said exit opening communicating with the enclosure to be conditioned and adapted to discharge the said mixed air from the said housing into the said enclosure, means responsive to the condition of the secondary air lfor regulating the quantity of secondary air passed vinto the said housing, and means responsive to the difference between the total pressure head and the static pressure head of the said mixed asi-aseo air iur' regulating the quantity or primary air passed into the said housing thereby maintaining a substantially constant discharge oi mixed air from the said housing into the enclosure.

8. A device for discharging conditioned air into an enclosure comprising, in combination, a housing with a first and a second entrance opening and an exit opening therein, said nrst en-k trance opening communicating with an air conditioning means and adapted to pass a stream of conditioned air into said housing, said second entrance opening communicating with the said enclosure and adapted to pass secondary air into said housing where the said primary and secondaryl air mix, said exit opening -communicating with the enclosure to discharge the said mixed air from the said housing into the said enclosure. means respony sive to the condition of the secondary air for regulatin'g the quantity of secondary air passed into the said housing, and means responsive to the difference between the static pressure oi the said mixed air and atmospheric pressure for regulating the quantity of primary air passed into the said housing thereby maintaining a substantial- 1y constant discharge of mixed air from the said i housing into the enclosure.

' troduced into said housing and around said into be conditioned and adapted duction means. said primary air in said induction means` comprising a stream `'i'yiiich ilows through said induction means and picha up secondary air which ows through the said openings in the induction means. said housing having outlet means for the mixed primary and secondary air. means ror regulating the volume of secondary air introduced into the said housing, lpressure responsive means in contact." with the stream of mixed air in the said outlet means for regulating the volume of primary intrcducedgintn the said housing to of mixed air at a substantially constant and manual means to adiust the said responsive means to thus govern the constant value of the quantity of mixed air discharged into said enl closure.

THOMAS A. BAKER. 

